I think it's okay? I mean currently, it's okay. Sex-wise, we haven't had that much smut from the MCs since this started. We only got teasers. It's been 31 chapters already and they just recently indulged each other. Besides the story so far, with the sex in it, hasn't gone off from the plot. And I think it's a bit inevitable now that it was revealed that Ryujin's a vessel where either an immortal or a demon can take over him. As cliche as it is, having a demon "take over your body" will, in one way or another, imply some sort of lust anyway. So I'd rather I see Imae and Ryujin's lightsabers than seeing Ryujin being molested by demons as they try to take over his body.
i like the smut and all, but i kinda feel like this would be better wihtout it. i feel like a shounen ai theme would fit better cause all the lightsabers feel a bit out of place. like some chapters make me cry and then theres just them having sex like-