The are introducing the goddess Kali and her dark skinned amazons. Seeing that Bell is the MC and young man, he is likely to be targeted by the amazons to be their mate.
"Sentenced to death! ...by snu-snu!"
Bell looks at the skeletons with crushed pelvises and can't help but whimper.
The Silver Bullet Suppressor is armed with the Beam Magnum (originally from the Unicorn Gundam), which is powerful enough to damage its right arm. That's why it carries a number of spare right arms, and has special manipulators that replace the damaged arm after each shot.
This fanart attempts to solve that issue by installing Goldymarg, which is used by Gaogaigar to wield the Goldion Hammer. :D
The funny thing is, if you look at the source tweet's replies, the Super Mini Pla Goldymarg DOES fit the Silver Bullet Suppressor's arm.
Doomguy, did you actually manage to stop murdering hellspawn for long enough that you got to impregnate someone AND actually be present sometime after its birth?