Ore no Ie ga Maryoku Spot datta Ken: Sundeiru dake de Sekai Saikyou - Vol. 8 Ch. 95

[MangaDex]

 

[SuperFlare]

Honestly I like to believe they actually did make love in the bath, but after the first time, the mangaka toned down the ecchiness a lot.

 

[LordNetsureim114]

Ngl, this excessive humbleness kinda getting on my nerves...it's OK to be humble and you should be humble, but bro just acknowledge the fact that you're not an ordinary person
Same goes for the princess too...you already said ur thanks once or twice and he already got the point that you're thankful to him, but holy shit, can't u not thank him every single time you meet him