Ren got out of class thinking about how the day's classes sucked. He just wanted to go home and whip out... omitted. It is reasonable since he was a teenager.
He exited the campus and headed home on foot. The school was close to his home. On the way, he was thinking about the day's material he should think of to "use" during his "fun-time", it was a certain big boobed motherly figure. It was his step-mom, Mikazuchi Hina. Hina had black hair and black eyes. She was pretty sexy looking. She emitted a mature and experinced vibe. His parents passed away in an accident 5 years ago and he was adopted by his mothers widowed friend, his current step-mom. He always wanted her badly.
She and her 2 busty daughters. They were of different ages. The older one was three years older than him and her name was Akame Mei. She had boobs that were a bit bigger than her mom's. She had black hair and brown eyes. She emitted a warm onee-chan vibe
The younger one was a year older than him and her name was Akame Yui. Her boobs were much more humble. She was not as busty as her sister yet as she was younger but she was bigger than average. She too had black hair and black eyes. Yui knew about his "fun-seeking methods". So, she despised him. But, surprisingly, she did not tell about it to the others. So he was fine with her knowing it.
Anyway, while all this was going on in his head, he was used to going by that path for a long time so he "switched off" his brain and walked while immersed in his thoughts.
He got pulled in to a dark alleyway by someone, with his mouth closed by the same person's hand. He instinctively screamed but that person told him to shut up and listen properly. He said, "Ren-sama, please listen. I am from the future. I am your descendant. You don't believe me? I know that you were going to go home and fantasize about your step-mom today and then get caught by Yui who will probably call you disgusting."
"I know this because I have your diary. I found it by accident in one of our ancestral homes and after reading it, I found you pitiful since you had to marry that ugly hag. So I brought it upon myself to use my 300 IQ brain to make a hypnosis technique and bring to you in a time-machine which no common people are allowed to use. But, I am a genius who works with the government and the maker of the machine so I got one chance to use it. I didn't waste my chance on just this, don't worry. I can still go to a few more time periods since the machine has enough energy for a few more jumps."
"By the way, I don't really need the technique because I have many lusting women after my handsome looks." while taking off his hand from his ancestor's mouth.
Ren's mouth was blocked off initially so he listened to this "madman" properly and thought that he would be a fool if he believed it. But after hearing the stuff about his diary, he was somewhat convinced. Then he got a bit angry and smiled bitterly after hearing the part where he was pitied on for marrying an ugly woman. But still he felt happy and thought that his genes must be something amazing to have a descendant with 300 IQ. He became stunned listening to his "descendant"'s endeavor's to get him women( and possibly a harem. He became instantly gratified but still felt suspicious since it felt too good to be true.
While Ren was thinking about all this, his descendant waited patiently as this was a lot to take in for a person (seriously that was loads of new information thrown at Ren in the span of a few minutes). Then he said, "I can prove that it works. Look at that man over there, I'll grab him when he walks over."
Ren was stunned. He hastily said," Hey! You can't just grab a person like that!"
His descendant casually replied, " Don't worry man, he won't remember a thing after I'm done with him" and grabbed him. Before the man could start protesting, he used his tazer to knock him out for a few seconds. Then while he was still groggy, he used his hypnotism techniques to hypnotize him in 10 seconds. Then he said," See, he is completely under my control but it won't last long because this is a quick hypnotism only. It will last for about 2 minutes."
Then he said to the man, " You will take off your shoes and dance like a monkey. After 2 minutes, you will wear them again and go back to whatever you were doing before you were pulled into this alleyway. You will also forget everything that happened while you were in this alleyway."
The man obeyed him. He took off his shoes and danced like a monkey. Ren was horrified looking at the man doing something without his free will. Now he was completely convinced. He asked, " Will he really not remember anything?"
His descendant replied, "100% sure."
Then he said, " Well here is the technique, practice it well. I will go now."
Ren hastily asked, " Wait, what is your name?"
He said," You can call me Jack. Yeah one of your descendants married a foreign man and their descendants became foreigners living in Japan. By the way, don't worry about having sex with women other than your "future" ugly wife, Your timeline will not affect mine so it will be fine."
"Since you were so polite with me, I like you ancestor. I will give you this gene serum and this additional technique which should be practised after taking the serum to make it easier for yourself. If you practice according to it, you will live a long life, your power will increase and your vitality will increase so you can do it with more women as you continue to practise it. Besides we don't want you to get bullied, do we?" He joked at the end.
"Oh yeah, here is a space ring for you. it will merge with you to give you an RPG-like inventory if you have it with water. As your "proficiency" in the technique increases, the inventory/subspace will increase in size. I have kept a few hundred "essential" items in it. Most of them are potions to keep women looking young. It also has a few life-saving medicines and stuff. Well, ciao." He said, running away while laughing.
Ren did not know this, but while his descendant was running away, he was wondering how the world would change due to his intervention.
Ren was so shocked at the sudden happenings. He wanted to go home and write about it in his diary. He looked at the guy running off and smiled, at the thought of his new fortune. He hummed all the way home thinking about the title for his diary page of the day.