Right? Everyone is losing their minds but I've always assumed Yami initiated the kiss. My money is on Hikari literally just seeing the worst possible angle at the worst possible time, and if she'd stayed a second longer everything would be largely ok
Unhinged prediction for the last chapter: Gojo has been imagining all the events of the series and we'll get a final panel of him sat in his workshop painting a doll that looks like Marin.