Frisk: Are you sure? It could backfire.
Chara: stop being a coward.. would you rather have him seeing us as a child forever.
Frisk: b-but still.
Chara: don't worry I got it and I am pretty sure he is the host of the other part,so when he detects that we are a host too,he will have no choice but to accept our demands.
Frisk puts a huge amount sealing spells in sans's room but still hesitates when she hears chara's plan.
Chara: After he is completely immobalized, we can talk things through easily and he will be completely ours.
Frisk: I don't think forcing him to become our lover is good choice chara.
Chara: don't try to play innocent, we can see each other's thoughts and I saw all those fantasies you had when we saw his human face.
Frisk: I-I... You are not much better either... I saw your fantasies too.
Chara: calm down bucko... It's either we do it or he starts doting on you like a sister and then... You can forgot about ever getting in a relationship with him.
Frisk:fine, but you better convince him or forget about getting my acknowledgement for any of your ideas.
Chara: he-hey you can't do that, it's our body and our karma.
Sans enters the room and looks at frisk having a conversation with himself( in his pov) and pities the child, he moves to his bed and falls asleep in ten something minutes. Frisk and chara instantly put their plans in motion.
Frisk let's chara take control, chara takes a few of sans's new bigger clothes from his wardrobe and goes to the bathroom.
Chara: guide increase our body age to 25.
Frisk: do it.
Chara's body glows in a faint blue light before her body begins growing to a more mature level. Over 1 hour later, chara has changed from a little pre-teen girl to a enchanting young lady, she looks at herself in the mirror and comments.
Chara: we look beautiful!! Increase those chances to 90% frisk.
Frisk: Can't argue for once* looks at her ample bosom* much better than before.
Chara wears sans's clothes and slowly exits the bathroom to find sans's snoring in his bed. She lays down beside him with any noise and falls asleep,using sans's arms as her pillow.
Sans lazily wakes up and tries to stretch his body only for him to be unable to move, his focus shifts to chara who was grabbing onto him like a teddy and instinctively tries to break free. Chara wakes up and like a steady predator activates the seals.
Chara: sealing magic: mana-seal trap
The mana Sans have barely gathered instantly dispersed, chara grabbed him by the shoulder and pulled him back to her embrace, their eyes locked as stare at each other.
Sans:*with a unbelieving stare and shaking voice* Ch-hara? H-How? Isn't it supposed to be frisk in this timeline?
Chara looks at sans with obsessive stare and taking advantages of his jumbled thoughts, kisses him. After two minutes, sans slowly regains his logic and tries to push chara away but the base difference of 8 points in strength is not something he can overcome even with his higher stat multiplier.
5 mins later, chara finally let's sans get out of her grasp as he looks at her and slowly backs away.
Sans:*gasping for breath, his face flustered and his voice stuttering* th-tthe hell yo-our are doing?
Chara: *licks her lips* don't look at me like that sans.. you enjoyed it too didn't you?*reaches her hand towards sans*
Sans: * tries to get away but get grabbed and immobalized* How are you here? Where is frisk?
Chara: calm down sans* puts her hands on his chest* we can be considered in a relationship now right?*smirks*
Sans: answer me or else ..*realising he can't use magic and is physical inferior to her in stats* ... Fine you win, now let me go.
Chara: take a vow That you will not try to escape or anything funny.
Sans: *flustered and annoyed* fine. If I try to run, my soul shall be destroyed by my own mana... Now get off.
Chara lets Sans sit on his own and sits opposite him.
Sans: *suspicious of her* what is your plan behind this?
Chara:* looks at him calmly* frisk and I are two souls in one body and* moves beside and nudges him* we both are the host of the other system.
Sans:*his mind blanks out for few moments and he curses his luck* so you are supposed to be my ally? Then WTH was that just now?
Chara: oi don't look at me like that ok, we have known each other for years now and then you just turned into a human that ranks top even among the ones of the surface in appearance. Had to give it a try atleast.
Sans: so did all that... Just to threaten me into getting a relationship with you?
Chara: pretty much*shows a teasing smile* and if you don't, I don't mind killing all of us including me and you right now. So will you agree to save your people or die because of our past?
They look at eachother, sans is mentally stunned by chara's boldness and hesitatingly agrees.
Sans: I don't have a option do I?
Chara: nope.
Sans: fine then... But no forcing me without my consent or I won't hesitate to kill us both.
Chara: come on sans,* hugs him* not even a little bit?
Under the constant bombardment of chara's requests, sans ultimately agrees to a hug. 2 mins later, sans and chara seperate with sans blushing crazily.