I asked my tsundere big-titted younger sister to pop my cherry

You are a total virgin-- never having had any contact with girls. The only females who will talk to you are mom, and your bratty little sister. You become so frustrated with being a pathetic virgin that one day you decide to get down on the floor and beg your sister to have sex with you.

Contains two different versions, one where the sister is a virgin also, and one where she has had experience. The differences include physical details (bleeding), as well as subtle facial expressions and changes in lines.

Also contains the pregnancy and pregnant belly f*ck scenes that this circle is known for.

6 base CG. 22 pages of variations. (With all bonuses included, total 132 pages.)

Images are 1280x960 resolution PNG files.
Bonus images (larger versions of the base CG) are 1200x1600 PNG files.