Girls just shy away from sucking at first. Once they give a blowjob, all their embarrassment disappears. They begin to work on the technique of moving the hands, taking the cheek, dipping deeper and deeper into the throat. If the cock is not too long, they try to take it all in their mouth, to get their nose against the man's pubis. A little alcohol and she can already suck your friend's dick. It's a nice feeling when you mold a modest girl into a real bitch. Now for her to take cum in her mouth and swallow it becomes the norm. Gradually you get to her ass. After that, she no longer cringes if you treat her in bed as an available woman. It even turns her on.
If a chick offers to tie you up, her main desire is to fuck your mouth with her pussy. She's only interested in your dick because she's not interested. And even if you cum, she won't suck it. So the blonde just humiliates the guy by squirting in his mouth.