Anybody got source?

Hai, I'm new here, sometimes in the past I have visited this site for...educational and research purposes. Now I always remembered this site as doujin heaven so perhaps you fine gentlemen can help me?

Recently while doing soem research I came across these pictures, I believe they are from doujin, does anybody have any source?





Edit: found them here: https://www.funnyjunk.com/channel/animemanga/Learned+a+new+word+today/xmRMLkz/13 while looking for an answer to the million dollar question "Is loli butt best butt?"

Are they both from doujins or the 2nd one is from actual manga? Also if you have could you post a link to doujin? :P

Edit, okay the 1st one is from an actual manga lol, can't believe somebody would put this in a manga ;D