Aiyoku no Nakaba, In to You no Doukoku: Injoku wa Seifuku no Shita ni

Sara is back to her hometown for the first time in ten years. She looks forward to meeting Mari, her old friend. They made a promise at the hill before, "Let's take part in a tennis competition together someday." However, Mari is totally changed. She is really nasty to Sara. Sara tries to put up with it, but another trouble happens to Sara. A part of her body gets big and becomes like a penis all of a sudden.... Also, she is obsessed with the desire that she wants to satisfy her libido....

(Source: ErogeShop)