It's being vague on whether or not he did anything beyond surface molesting, but still basically netorare, unfortunately. Not sure what I expected from this author.
Edit: It's worth mentioning that he's fully clothed the entire time and the "ah" sound doesn't indicate penetration. Considering she's a small-framed teen virgin, that'd elicit a more extreme vocalisation. Even surface-level molestation can cause that short of dead-eyed trauma provided you value yourself and your body. Of course, all of this is speculation but if I find out there was indeed penetration then I'll drop this, not into that kind of events.
Edit 2: As of the latest chapter she apparently isn't a virgin, but the rest still applies.