Here's a moral question for you kids.

[kellychaos]

I don't know if it would necessarily solve the problem but what might, for the sake of comedy, be a fun thing to do is to have Friend B's fiance approach Friend A and ask why he still has nake pictures of her on his computer just to watch him stammer and stutter. It may even happen, under this type of coercion, that Friend A might decide to remove them on his own. This is assuming, of course, that Friend A and Friend B's fiance are on speaking terms.