Mace is just being a brat, he doesn’t actually have business cards.
So, like this answer implies, Mace and Jackie were designed for the sole purpose of appearing in comics like their first few appearances. Just pair them up with some older woman, be it a teacher or neighbor or what-have-you, and then watch the sparks fly. The only reason either of them have appeared in any yaoi content at all is (much like with this Ask) by popular demand. So while I’m not against using them that way, it’s not really what they were meant for and kinda conflicts with their initial characterization. Still, it’s been a minute since Mace’s last Ask, and he was eager to get in the spotlight once again however he could. 😉
Also, here’s the QnA video I did last month for my supporters: