Why would you even wanna receive blowjob in these awkward positions. It's not like it'll feel better. Standing straight is the best BJ position because then you can look her in the eyes and stroke her hairs and make her forcefully choke on your dick. You can also watch her swallow your load. And it's a superior dominating position. The roastie is kneeling Infront of you to pleasure you makes it the ultimate alpha move tbh.