Nyotaika Tensei shita Boku wa Futanari de Musou suru!? ~Demo, Onee-chan-tachi ni wa Zettai ni Katemasen!~

“With this, it's impossible to flirt with girls...!” I died in a car accident while still a virgin, and was reincarnated as a cute girl named “Tanya”! On top of that, my sisters are always being mean to me for some reason...! If only there was something I could do to gain the upper hand... Then, a gruesome item from the black market caught my eye! —Wearing this ring transforms the clitoris into a “penis.” “What I was missing was a penis...!” However, my older sister took advantage of a momentary lapse and stole the ring...! This is like giving a demon a club... no, “giving my older sister a penis”! Translated with DeepL.com (free version)