FSDSS-463 I'm getting married... My childhood friend who lives across the room secretly cuckolds my fiancé just before getting married, and they fall into dirty sex Natsu Igarashi

This is my fiancé... One day, Natsu, a childhood friend who I've loved since high school, came back to my parents' house with his fiancé. The childhood friend I used to peek through the window every day in high school will soon be someone else's...I can't stand the naked body I see through the window, so I approach Natsu and cross the line...Days of muddy sex that I can't tell my fiancé. has begun...