The first one was one where this guy's nickname at school is "Biscuit", apparently short for "Seabiscuit", due his sizable endowment. Then two girls take him up to the school's roof to ask him to show them, planning on laughing at what they think will be an exaggerated size, only to discover that he lives up to the nickname. Threesome sex ensues.
The second was netorare one where a bro-con girl was raped in front of the brother she was in love with, while at the same time a female relative of her rapist (can't remember if it's his sister or cousin or something) seduced said brother into consenting sex.
Any help would be appreciated.