Yeah the subject / woman I was doing this for was -extremely- beautiful and my erection was incredibly rapid. When I draw back the foreskin it was almost too late, when fully erect it is impossible (very painful) to try and draw it back all the way. If I'm -extremely- excited though (and I was here) I can sometimes do a full drawback and it feels deeply sexual, but after the climax I can hurt a bit. Only do it when I am -really- horny, like in this vid. Usually I just keep the foreskin forward and rub my glans through it...
https://xhamster.com/photos/view/3739060-62635759.html#content
https://xhamster.com/photos/view/3739060-62635758.html#content
for fully erect with foreskin back.
https://xhamster.com/movies/4747467/uncapped_masturbation_1.html
https://xhamster.com/movies/4747493/uncapped_masturbation_2.html
https://xhamster.com/movies/4747520/uncapped_masturbation_3.html
https://xhamster.com/movies/4747542/uncapped_masturbation_4.html
https://xhamster.com/movies/4747577/uncapped_masturbation_5.html
and
https://xhamster.com/photos/gallery/4730950/uncapped_masturbation.html