You decide to take a shower, wanting to explore your new body and also make use of the mirrors in the huge bathroom. Once your clothes are in a neat pile on floor (you have become tidy out of respect for your host). You stare at yourself, looking down and also looking in the full-length mirrors. This all hit so fast. You just now catch up with what he told you. You are his adopted son? Reality has changed? That will all be something to check out later. Right now, you want to see this new body.
First off, you are definitely improved sexually - even as a 16 year-old, you not only hang soft a good seven or eight inches, but have a very nice foreskin and testicles that look large and capable. Your body is smooth and trim - not overly muscular, with some of the soft contours of youth over what is obviously good muscle. You look like a swimmer or gymnast, not shaved but having only the first spotty patches of hair around your genitals and armpits. No trace of a beard or body hair.
That brings you back to your face. You are nice looking, maybe a little better than average. Not stunningly handsome - your features are just a touch coarse, your teeth a bit too big, your nose a little small. What is really odd is that you do not recognize it at all. It doesn't look like your friend, or your former self, or anyone you knew. Actually, you look like a British teen - there is something about your look that just makes you think of England.
You take a long, hot shower, running your hands over your whole body. Of course, this includes your very sensitive cock, which you masturbate to erection and an impressive ejaculation that splats against the glass of the shower. The sensations make you pant, wide-eyed. You dry off and go into your room - and stop and stare in amazement.