Maybe a Stinger Bee. Maybe just a Spider. Possibly the Fire Spider in your signature? Tough to tell from the colors in that picture. Yes, that looks like a sperm plug.
I bought it as a hatchling as a fire spider and looked online for a reg spider and fire spider. looks like a fire I was just maybe looking for a little confirmation. I thought that was a sperm plug. I am looking to breed him with my butter. Should make some nice combos.
Snakes 0.1 Butter
0.1 Het Clown/Ghost
1.1 Pastel 100% Het Clown
1.1 Pied
1.0 Bee
1.0 Fire/Spider
1.0 Normal
1.0 Pastave
1.0 Albino Snow Corn
1.0 Albino Black Pastel
FYI
The "sperm plugs" you see are actually just hemipene shed, nothing more. It is not a "sperm plug". It does not mean that he is ready to breed. Ball pythons having sperm plugs is a huge myth that unfortunately got used in the hobby and people refuse to stop using the term. If ball pythons did have sperm plugs, you would never be able to have multiple sires in a clutch.
Male ball pythons are capable of breeding at a rather young age. I know for a fact that they can breed as small as 500g and have heard of them breeding even at around 300g.