Disembodied Penis Test (Patreon)

One thing that I've wanted to find a good method for is disembodied penises, since it makes it possible to create scenes involving a guy without having to actually model a guy. So did some looking around to see what other artists have done, tried out a few methods.Do any of them look alright? I'm always scared they just end up looking like dildos kinda stuck inside the girl. Also ignore the terrible, half-assed gap on the right image.