Zoku!! Fudanshi-kun ni wa Himitsu ga Aru

The cheerful and handsome Shion and the seemingly cool but secretly a fudanshi, Sota, have become a couple and are happily (and sometimes intimately) spending time together. However, one day, Shion unexpectedly says, "I want to introduce you to my mom." Sota, who hasn’t yet come out to anyone about his relationship with Shion, struggles with what to do next—what should he say? His internal conflict deepens as he tries to figure out how to handle the situation.

(Source: Homesha, translated)

Note: Includes an extra.