Hope he doesn't mind her crying out when he pushes in further, not a sound of pain though. Oh no, she's just making the most pleased noises she's ever made in her life, even as it feels like she's being stretched to the limit with him inside her.

... Which Grimlock will find that there is a limit, and it's not quite half-way, before Miria is squeezing his spike much too tightly.

"Ah... T-too much!"