You asked me how would I, as an experienced lover (which I am not too sure I am), make love to a girl I knew was a virgin.
My mind has to imagine this because I don't think I have ever been in this situation. I know that she wasn't when I was [G] and, being shy in the extreme in my younger days, I was never the one to place myself in a situation where I might be rejected. I hated rejection (don't like it much today, either)
I visualize the circumstances like this...a fairly lengthy "getting to know you" relationship. There had been some heavy petting from time to time and some very heavy breathing. A confidence from her "I never have before" would have me restraining my desires until one day (night?) we decided that we would have a weekend away together where we would "do it."
As we entered the room at the motel I would turn to her and say, "Look...if you want to change your mind, that's ok." And MEAN IT!
I would lower the lighting and sit on the bed and offer to make us a drink. It would be important that she gave her approval to each stage of this first time. I would try to convey that each progression to the ultimate was her decision alone. If she responded to my caress of her breast I would start to unbutton her blouse and caress the top of her breasts over her bra, while continuing to kiss her. If I can now feel her acquiescent response and I would be emboldened to undo her bra and free those enticing breasts. This would probably the first time I have seen her breasts and I cannot keep my eyes from devouring the sight. I would kiss her breasts and run my tongue around her nipples, enjoying them hardening and responding.