彼女の愛海と妹のいるリビングのドアを開けるとそこには信じがたい光景があった。常に聡明で気品のある愛海が狂った笑みで妹に犯されていた。愛海が喘ぎ声を出すたびに口と秘所から精液がゴポゴポと溢れくる。俺との行為のときは愛らしい声を出す愛海だったが、妹のペニスが押し込まれるとと獣のような声をあげ全身を痙攣させた。妹はニタニタと笑い、ペニスを引き出すと大量の精液がソファーに流れ込む。がっぽりと口を開け、下品に収縮を繰り返す愛海の秘所は、以前のものとは違っていた。背負いきれない劣等感と興奮……俺は変わり果てた彼女と別れを告げるために震える足で愛海のもとへ進んだ…。　台詞無し差分はこちら→http://firestorage.jp/download/e263d8c9c2305119c19ba3c33b1f9e74e9836273 （PASS:tikahii）

When I opened the door to the living room with my girlfriend, Ami, and my little sister in it, there was an unbelievable scene before me. Ami, who was always wise and elegant, had a deranged smile on her face and was getting raped by my little sister. With every gasp Ami let out, cum overflowed with a gurgle from her mouth and vagina. When I was doing it with Ami, she let out a lovely voice, but when my little sister's penis plowed into her, her voice was like that of a beast and it made her whole body convulse. My little sister was laughing with a broad grin on her face, as she pulled out her penis and a huge amount of semen poured out onto the couch. Ami had her mouth wide open and her repeatedly, vulgarly contracting genitals were different from before. The much too heavy burden of this feeling of inferiority and arousal... With shaking legs, I stepped forward towards my utterly changed girlfriend, to bid farewell to her...