and ERWIN! wait.. now that I think about it, the gif is definitely from AOT(attack on titan) but the gif could be just a creation for an OTP ship or something... x) I don't know how they created that because it looks so real that it could actually be in the anime.
i just seen this eruri yaoi anime gif on tumblr but i have no idea what's the source, anyone knows? (≧A≦)
ps. NSFW:
https://gifsyaoi-hard.tumblr.com/image/147267473773