Thanks for the chapter.
Amai Batsu(Sweet Punishment)? Gaman nanka shinai(Don't hold it in)? If there's something common with Luna's choice of materials, it's that they're on seemingly on the submissive female, uke female, or mildly M. Luna's on the masochistic side, folks. Taking that into account, this explains the cosplay "session" a few chapters back, she likely had a 'maid play/situation' in her playlist and was "immersing" out loud.
With her preference taken into consideration, we can assume that Luna doesn't really see things where she is the one on the attack as anything sexual by nature.
Every sus things that were shown where Luna is on the attack, it turned out to be actually more innocent that it looked. *slurping Naoto's ice cream, small drink kiss game towards Naoto, etc.
Likewise, the innocent things where Luna is on the receiving end, it appeared more sus than it actually is, with moans included.
*denma massage, calf stretch from Naoto
If we apply what we know now, the alleged "kiss by the door" (because INNOCENT UNTIL PROVEN GUILTY) is more likely to be innocent upon the reveal. Assuming it even was a kiss, compare her composure to that when Naoto was actually shown kissing Luna a few chapters back... yeah, like night and day.
The opened condom wrapper on the other hand, we literally got nothing to work on. As that stands, it's really just an opened condom wrapper. We don't know exactly who what when where how it was used. We can only assume who, and where it was used given the location where it was found... if it even was used (as intended) in the first place.