The Student Council President is My Sexfriend

And so Iroha started living a two-timing life, dating her boyfriend Issei while having sex with her sexfriend Tooru.
Taking care not to get caught by the boyfriend, Tooru then thoroughly ravished Iroha and repeatedly, relentlessly cummed inside her, which in turn made her cum a lot that she had to gasp for air.
Eventually, Iroha’s body started changing. She became pregnant with a baby she should not have conceived.
Afterwards, Issei discovered his girlfriend’s affair. Realizing that she cheated on him and even got pregnant, Issei…