It's a very rare touch, but I personally love when kissing is made exclusive to the husband. Kissing is a strangely intimate act, and it feels like an interesting dynamic when she accepts to do all these things with the bull except for that. You really get a sense of why she's doing it, and keeps her in control.
Also, it's way too early for creampie finish imo. She's had sex with other guys literally twice. Creampie is like the final major milestone. Doing it right away would be speedrunning the progression. Even Yumi, who is sluttier, left that for the very end.