I always had this idea in where during the events of Battle of Gods, where Goten and Trunks go into the prize room, a extremely horny Whis comes in a bikini with a big butt and tells Goten and Trunks about the wonders( yet within the context of homosexuality, disgusting for homophobes) of sex.
From there, they are all but naked as Goten and Trunks dominate Whis and ejaculate inside him.
I just wish a illustrater can come and make my wish come true......