Because it's technically not penetration, but it's the premise to, and hey, it's got spikes and valves and fluro-fluids, what more do you want.
Both of these are actually really speedy mspaint sketches i made to illustrate positions to RP partners mid gaming.
I just so happened to look through the folder they were stored in and thought they deserved lineart.
If I wasn't self-banning from Minecraft so I don't lose my Mo' creatures mod in an auto update, i wouldn't be so productive XD
That said, there's nothing fancy, just proper lineart and some greyscaling.
Sunny x Raider.
Raj x Jazz