Despite being all alone, depressed and mentally ill, Yuuri falls in love with you. Fortunately she at least has good looks on her side, and she uses that sole advantage to woo you.
Your no good elder sister who loves sex does whatever she can to squeeze you dry of $$$ but... eventually, it's not the money she's after but rather your...? (CV: Megumu Morino)
One day you happen to be together with the senior girl that you've always adored after school. She said "... I have something I want to discuss with you..." (CV: Narumi Aisaka)
This time she's going to let you blow your load inside her! Wouldn't you like to spend some MORE time with your busty junior girlfriend? (CV: Uni Koishikawa)
She may live bang smack in the middle of nowhere... but this girl has all the important prerequisites sorted. Big Breasts / Tsundere / Childhood Friend (CV: Yuu Shimotsuki)