Welcome to the NTR world (〜 ̄△ ̄)〜
Netorare?
http://tvtropes.org/pmwiki/pmwiki.php/Main/Netorare?from=Main.NetorareGenre
Here you can get an answer "what is NTR"
NTR is pretty much rape.
liek raping till they totally forget about thier BF or GF. also has alot of blackmail in it.
Aaaaaaaawwww so adorable ヾ(☆▽☆)