Well blowjobs can be mindblowing two ways. Mentally and physically. Mentally your can arouse your partner by see what he likes. He might be into dominance or like to be submissive. If he likes dominance deepthroating may be the way to go. Let him hold your head and guide his penis in and out. Practicing this will help but gagging may turn him on. It does me when my wife does it but remember she gets turned on by being submissive. If he is submissive try alittle cock tortue. Smack it, slap it, bite it, talk dirty to him. Sqeeze it hard and give him some sexual pain. Pinching nipples helps during this. If none of that sounds like you try giving the BJ in different positions like laying down standing up. If in the normal him standing and you kneeling work your tongue on the underside of his cock just under the head. Its usually a sweet spot. Try squeezing the balls. If he is up to exploring a finger or dildo in the anus intensifies the orgasim and pleasure in most men. If he's to freaked to do it he'll probably pych himself out. Another is to put your hand in the 0 sign like you would jerk him off and put it to your mouth and blow and jerk him off at the same time. Lots of lube or spit will be needed to make this best. Not only will his intire penis be getting touched by something the hand and the mouth are two different textures and will feel awesome. Hope that helps.