Do it mate. I haven't seen TS Sofia but I've seen a few others. For me (I've written this loads of times before in various places on UKP), I have zero interest in shagging a guy, but for some reason, very occasionally I get the orge for a TS meeting. The absolute key for me is that facially they look as feminine as possible.
I had one TS experience where the face was very masculine (not bearded or anything, just VERY obviously a guy) and I remained completely flaccid throughout and gave up after 15 minutes. But the other experiences I've had - two in particular spring to mind - where they looked very feminine, it's a great experience and feels so 'wrong', which is probably why it's so enjoyable.
I've always 'topped' rather than 'bottomed' (meaning, I've never been shagged up the arse, I've only shagged them up the arse) - for me that's a step too far. But everything else - including them giving me OWO and me giving them OWO - I've done, and it's great.
I've just given up trying to explain why I enjoy it, especially in view of the fact that as I say, the thought of giving a 'normal' guy a blowjob does absolutely nothing for me. Just go with the flow I reckon, so if you want to give it a go, just go for it!
Happy to answer more questions over PM.