Responses
I found it after searching through 33 pages that had the word 'alien' in them
https://www.mangago.zone/read-manga/robber_robert/
beta
I'm not even sure if I read it on this platform or not, but the mc is a cyclops alien guy who goes to rob a random shop that has this slime/goo guy working the register. When he realises that the register can't be accessed because the police were notified he realises this egg sex toy(?) is super valuable and tries to steal it, but the egg explodes into a slime thing and the only way he and this other guy can get free is to have sex. The cyclops dude was super spikey and was a grey colour, and the slime guy was orange and had two antennae.
Any help is appreciated! ╥﹏╥