引きこもりの地味姉を普段からバカにするボクは、ある日オナニーを覗かれる。でも、こんなヤツに遠慮はいらない！逆にオナニー見せつけると…姉の押し殺していた性欲が解放！？普段は絶対見せない爆乳でパイズリ＆強●挿入！そして禁断の連続中出し！すると、その日から姉の欲情対象はボクになってしまい…【姉について】健康的/色黒/隠れ巨乳/地味女/メガネ女子/隠れ淫乱/喪女/陰キャ女子/デカ尻/芋女/隠れ変態/豹変痴女/性欲モンスター/淫語ヤバい/おっぱい成人/揺れまくりデカ乳/濃厚パイズリ/逆解らせ/

I usually make fun of my shut-in, plain older sister, but one day she catches me masturbating. But there's no need to hold back with someone like that! I show her my masturbation in return… and my sister's suppressed sexual desires are unleashed!? She gives me a titjob and forcefully inserts her huge boobs, which she never normally shows! And then I give her a forbidden series of cumshots! From that day on, I become the object of my sister's desires… [About my sister] Healthy/Dark-skinned/Hidden huge boobs/Plain girl/Girl with glasses/Hidden slut/Unpopular girl/Introverted girl/Big ass/Poor girl/Hidden pervert/Sudden transformation slut/Sex monster/Dangerous dirty talk/Adult boobs/Huge boobs that jiggle like crazy/Intense titjob/Reverse humiliation/