Think it was this one?
http://www.mangago.me/read-manga/lead_heart_attack_on_titan_dj/
found it, the title was egoist by yuto. It;s a series so ill just post this https://myreadingmanga.info/tag/sweet-bitter-yuto/
The Yuri on Ice DJ from that series was good too, all of their work seems to present the two MC's as equals, so I would recommend them too!
another yaoi where levi was pregnant but didnt want erwin to find out (づ ̄ ³ ̄)づ