I'm telling you I read this before or I had a dream just like this but I don't think the plant thing was in there but still this was a short manga which is not my taste but still it was pretty drity I just wish the sex part with the scientist would of been longer put it all to together it really doesn't stand out but I haven't read much tentacle... Uhh I kinda don't want to say the next word
You could be thinking of Crimson Spell.... It has one tentacle scene and it's kinda short but it's pretty similar to this one. Btw, if you haven't read Crimson Spell, you should. It's amazing (=・ω・=)
I'm telling you I read this before or I had a dream just like this but I don't think the plant thing was in there but still this was a short manga which is not my taste but still it was pretty drity I just wish the sex part with the scientist would of been longer put it all to together it really doesn't stand out but I haven't read much tentacle... Uhh I kinda don't want to say the next word