Mum? Mei Hatsume just appeared in the bathroom

You are a normal person, in a normal world, no powers, magic or quirks to speak of. That is until you are thrown into an adventure after every weeb's favourite inventor teleports into your bathroom.

13+ for sexual references

Oct 18 2021: #1 in reverse isekai #4 in Hatsume
Oct 23 2021: #3 in Hatsume
Oct 28 2021: #1 in Hatsume
Nov 1 2021: #1 in both Hatsume and reverse isekai.
Nov 2 2021: #1 Hatsume #2 Mei and #1 reverse isekai.