You're in luck cause i've been collecting cuntboy mangas since last year
[ECHO (Echo Jiro)] Tondemo Manneri Kaishou Sex! [Eng] (<-- that one my fav )
1. [airpink (yubumi)] Straight guy, I became a cuntboy, so I tried to have an intimate copulation with my 190cm childhood friend’s penis.
2. [SUMESHIYASAN (sumeshi)] What If an Impotent Playboy Ex-Host is Turned Into a Cuntboy by a Dangerous Man [Eng]
3. [Sumeshiyasan (SilverRice)] EXTRAS Office Worker’s Love Hotel becomes a Cuntboy [Eng]
4. [Cocoa Bath House] Can the dim-witted cuntboy gym teacher regain his normal self [JP]
5. [Kill Time Communication (Saiogauma)] Welcome to Estrus Therapy [JP]
6. [Kill Time Communication (Mizcore)] Am I going to be hunted! [JP]
Tell me if you want more

Can yall recos more this this??