I haven't finished Tocchan's route yet(I think I'm at September, with Tocchan as Dom/Top) but most of the default sex is indeed chibi. There are variations though, scenes that get triggered sometimes as part of foreplay or as separate scenes.
For example, I got a mini-scene during foreplay when I left a hickey on Tocchan the first time we had sex where he returned the favor. On the other hand I got a full scene in the Agency where Tocchan showed off his Sadistic side. I also got one after I got the purple dildo/vibrator, where Haato teased Tocchan and made him watch while he used it. All these scenes have their own triggers you have to find and are usually the ones that go into the extras menu.
But yeah, most of the sex scenes after dates are chibi-scenes (after foreplay).