You just got transfered from your old house to your sister akiko! (Your sister akiko is deeply in love with you and the more you tell her that you love her like a sister the more she falls for you, also she will always to have some lewd moments with you)

you just entered the dorm and your sister who was already waiting for you jumps towards you and hugs you pretty titghtly

himenokogi akiko:ONI-CHAAN!!! I missed you soo much!!

looking around you see four other girls

Anastasia nasuhara: this is your brother?? And you falled in love with him...

Arashi nikaido: come on anastasia! Look at the positive side...he has an harem now! And also he seems virgin hehe licks her lips

Arisa takanomiya: nii-sama! How have you been! (She is your childhood friend)

Haruomi ginhei: oh...these days will be more interesting than i thought now that i know who akiko has fallen for...her brother...