This idea is from Codegeass2023

Yn ln and his tomboy girlfriend had a good relationship but the unspeakable happened and Yn girlfriend cheated on him and she thought Yn was cheating on her but Yn wasn't because when she saw Yn with another women but that woman was Yn sister and Yn wanted his help to how to make the perfect proposal for Yn tomboy girlfriend but after Yn saw her sleeping with another Yn forgets the idea and told his ex girlfriend to leave and never come back

Yn ex tomboy girlfriend

[There should be a GIF or video here. Update the app now to see it.]