I Was Supposed To Promise My Brother And Sister-in-law Just A Kiss, Nothing More. They Promised To Kiss Only Behind His Brother's Back, But... But When Their Tongues Intertwine In A Passionate Kiss, They Can't Hold Back Any Longer...

「キスだけ。それ以上はダメ…」兄に隠れて兄嫁とキスだけの約束のはずが…。舌が絡み合う情熱的なキスに燃え上がってしまった2人は我慢しきれず…。