Similar to #370006 where MC doesn’t get the girl he initially wanted, but a girl he initially ignored schemes to be with him. Or straight up reverse ntr like #391909 where a girl whom MC had no plans of getting together with, schemes to get together with him.
Sources:
#370006 – Osananajimi no Onee-san ga Netorareta node, Boku wa Anata no Imouto to Sex shite mo Ii desu ka? | Because my Older Childhood Friend was Taken Away from Me, is it Ok for Me to Have Sex with Her Little Sister? by Shingo
#391909 – Imouto-kei Kyonyuu no Shinyuu ga Kanojo no Iru Ore o Yuuwaku Shite Kita | My Sister-like Friend with Huge Tits Seduced Me Even Though I Have a Girlfriend by Mataro