AnimePeople

This hit really close to home. From unaccepting parents to "You both look good today"
It has touched my heart in a way that is so direct.

Actors are supposed to, as the name provide: act.
If you have a passion for acting you can become an actor.
It is nowhere logically connected that where you are in a romance show like this, with zero to any kissing, you are expected to not be uncomfortable kissing.
Minato has also kissed in his works, with another guy, which also happens in here : this further provides that the production is not opposed to kissing.
But, if the main couple really never kissed in the manga either then-

I'm sure the actor just was uncomfortable with kissing someone. I mean he never did it even in the straight romance once