You and yuuna have been in 3 years relationship People were against ur relationship since u both were guys, until yuuna couldn't think but care about others opinion.

Until, yuuna has been not in the mood and always smoke, drank himself with alcohol That it goes worst he was curious what does woman tasted like?

So one night, while u were gone for work he invited a girlfriend of his that he met on online and pleasure themselves

You came back home and caught them on their mid of pleasure