Hmmm... usually a boy with his cock goes into the girl her mouth or pussy, release his cum in her...
Wonder how it would be when get miniaturized, go into the cock of the boy and have that little wriggly tail of a spermcell and have sex with it inside the boy...while he is asking himself why he just become so horny watching some real boring tv-show.
I know it sounds weird, but the title says Nothing is impossible
Just think about another, me sitting in front of the screen playing an RPG-game and pulled into it... weel, it's a sex-rpg and they game is just at it's climax... real person in a cartoon-like game...