As the youth flew off with his little sister, Sirzechs could only sigh at the situation. Not only did the Pheonix family lose the marriage agreement, they also lost one of their children. Though he also had to commend the brains of the youth, Alex, as he turned the situation against Rasier by pointing out that he ordered both Alex and Rias to be killed. As Raiser essentially tried to murder the heiress of the Gremory family, they won't be able to cause as much noise.
He then looked over at the family in question, and noticed that while most were fuming with rage, there was one, the daughter that looked to where Alex and Rias disappeared with sparkling eyes. He recalled her name was Ravel, and a thought occurred that this might be easier to settle than he expected. He then asked his wife and queen, Grayfia, to follow the two in secret.
Ravel, the girl in question was watching Alex fly away with Rias and she recalled all the stories she used to love. The ones where a hero would save a princess, though he announced that he wasn't a hero, that was all Ravel could see him as. She then wondered if she'll see him again in the future.
Finally the two in question, were flying away from the party with smiles on their faces. Alex decided that before sealing the deal, he would need to come clean with rias. He then formed a magic circle and pulled a decorated wooded box out from it. After opening it, Rias saw the fifteen evil pieces sitting inside. With even more questions in her mind, she tried to ask Alex, but he beat her to the punch.
"I want to tell you all of my secrets, but I can't due to reasons. If you accept my bishop piece though, then I'll be able to share them with you." One of the restrictions on the players of the game was that they couldn't freely share their circumstances, but the way around this was if the person in question was contracted in a way to allow traveling with the player. If Rias accepted his bishop piece, then he would be able to share his story and take her with him when he left the dxd world. But he couldn't explain that until she accepted it.
As she looked at the bishop though, Rias could help the hesitation in her heart. Accepting this would mean possibly giving up all her dreams, and ambitions. However she recalled that an hour ago she wasn't able to follow them anyways, even if she accepted it then there was still a chance of her being able to. She also thought of everything Alex just did for her, not accepting was like saying she didn't trust him. She then accepted the evil piece without a second thought. Alex smiled and explained,
"You don't have to worry, it won't effect following your dreams. That piece will only help you in the long run actually." After that Alex explained everything about himself to her, including the reason he waited so long to do so. Rias was in shock about Alex's history, the other worlds, and the fact that she would now be able to follow him to these other worlds. Taking her lifespan into consideration, she would have more than enough time to follow Alex and fulfill her dreams. In fact going with Alex would help her fulfill them as she would get to learn from these other worlds as well.
She also felt warm in her heart when Alex told her that part of the reason he came to this world to begin with was to meet her. He coolly avoided mentioning that in another world thousands of people had seen her naked on tv though. As they had continued flying all this time, Alex now felt that they were far enough away from the party, and couldn't feel anyone following them. He found a small lake within a forested area, and landed.
{A.N. I haven't written 18+ scenes before so go easy if it's not good.}
They hadn't even landed yet, when Alex had her out of the Pheonix dress, and he burnt it to ashes. Standing in the middle of the forest in nothing but her underwear, he noticed that these matched the dress, and they swiftly joined it to becoming ashes, leaving Rias standing naked. He admired her naked form as he swiftly joined her. When he removed his underwear, her eye's went wide at his size. He could understand her surprise, as it was different than his size of earth. He had a theory that it was an affect of the Saiyan bloodline, as it would also explain why chi chi and bulma stayed with Goku and Vegeta.
Rias then practically tackled him, as they started kissing in the buff. He enjoyed the feeling of her skin on his, as he brought her down to the ground on top of her. After kissing for several minutes, he then started making his way down her body, kissing all the way. He stopped at each of her nipples, leaving each one slick with his saliva. He then continued further down, until he reached her hidden valley. Finding the start of a spring, he attacked her with his tongue until it became a river of moisture.
"Please.." She begged him. He moved back up to seal her mouth with his, as he prodded her with his tip. Alex then slowly entered her, stopping at a barrier, before it then broke with an almost audible pop. Rias gasped at the sudden intrusion, and he slowly went further until he could no more. Due to the slight tears in her eyes, he waited until she gave him the OK, before he started moving his hips back, then went forward with more speed.
"AHHHH" she gasped at the motion, then he repeated the action. With each time faster than the last, Rias's voice got louder with each thrust, until she was moaning without restraint. As Alex picked up speed the sound of flesh smacking became audible, and Rias wrapped her legs around him.
He thrusted for almost twenty minutes, until he couldn't hold it anymore, and he spilled his seed inside of her while Rias gave her loudest moan yet. He then rolled over so that she was on top of him as the two cuddled on the grass. Alex wasn't concerned about getting her pregnant, due to the fact that Devils had a very low reproduction rate. Even if they were together every night it could take years, or even decades before having a child.
They both then fell asleep in each other's arms, exhausted both physically and mentally from the day's events.