A srs synopsis
First, congrats on creating something epic. Now for some technicals:
The kiss looks a little forced, more like they're doing it as a dare than passionately thrusting their love into each other's mouths. I think this is because mario's eyes look a little too clenched.
Second, there's nothing going on in the background. No scenery, no clouds, nothin. It feels to me like they're experimenting in a bedroom with blue wallpaper and a pipe rather than expressing their intimate moment for all of the mushroom kingdom to see.
The lines could be a bit cleaner, but that's attributed to the style I suppose. I like the lack of shading, it gives this a nice cartoony flare.
Final Judgement: Thank you for ruining hundreds of people's days.