I can see why you came to us with your questions Melania, and you were right to be concerned. It's really not sounding too promising 
He only wants to gain 10lbs. The AAS he wants to use is much too strong/inappropriate. He has latent anger issues. He's a recovering opioid addict (?) - is he going to come off the suboxone?
At the end of the day I will of course advise on the safest way to use if it comes to it, but I'm really not sure it's the right choice for him.
It sounds like he just wants to try out a new drug, given his low expectations? Generally speaking, if he eats right, he might expect to gain anything from 20-40lbs from a decent first steroid cycle (minus the suboxone). And then he'll be an even bigger potentially angry man...
Also you say he already takes testosterone? As in TRT (testosterone replacement therapy) from the past use of opioids?

He only wants to gain 10lbs. The AAS he wants to use is much too strong/inappropriate. He has latent anger issues. He's a recovering opioid addict (?) - is he going to come off the suboxone?
At the end of the day I will of course advise on the safest way to use if it comes to it, but I'm really not sure it's the right choice for him.
It sounds like he just wants to try out a new drug, given his low expectations? Generally speaking, if he eats right, he might expect to gain anything from 20-40lbs from a decent first steroid cycle (minus the suboxone). And then he'll be an even bigger potentially angry man...
Also you say he already takes testosterone? As in TRT (testosterone replacement therapy) from the past use of opioids?