(Desperately) looking for two hentai manga, help appreciated

I've never spent this long looking for something, I hate waiting. Here is what I'm trying to find:

Loli is secretly in love with her older brother and vice versa. Neither of them want to admit their feelings to each other. Loli's older brother has a friend. Friend blackmails loli into doing things, takes pictures with his cell phone, etc. Brother eventually finds out because friend sends him a picture that he (friend) took of Loli. I don't remember any other details, so hopefully that is enough.

I remember even less of the second one. A bunch of kids are on a school trip or something and one of the teachers invites his friends to have a gangbang with the female students while the male students watch. I just remember that the teacher/principal/whatever was this gross fat dude.

Thanks in advance!