As research has shown, this is the best bootayy manga ever shown in yaoi history. His bootayy is very round and full, very tasty as well. Any seme would want to get at least 1 squeeze out of that bootayy. Even women would want to touch that bootayy. Also research has shown that after someone finishes reading this, they may have severe bootayy fetish. Read at your own risk because you may as well have severe bootayy fetish. One word I have to say about this bootayyful manga is: bootayy.
Sources: Bootayy.org AllYouNeedToKnowAboutThatBoottayyy.com RoundBootayysAroundTheWorld.com FineBootayys.com AmemiyasBootayy.com
(This was made for fun, the sites (probably) dont work )
What manga is this?
http://www.mangago.zone/read-manga/ren_ai_shinan/mf/v01/c002/
If you mean the first picture, unfortunately it's not an actual manga. In the earlier topics someone explains this.
I can recommend to you something similar:
http://www.mangago.zone/read-manga/dekiru_otoko_no_sodatekata/