I have a "signature series" of positions I use when I want to be impressive. They're not too exotic, but they work well.

Sex starts as usual, with foreplay and I work her onto her back. Entry is vanilla missionary until things are moving properly and everyone is comfortable. Then, I pull out, bring in my legs so I'm kind of on my knees, re-enter, and lift her legs into position 1-nsfw. I'll move her legs out wide and bring them back in while I'm at it and the position provides a lot of easy leverage for penetrating deeply. The blood flowing back down her legs to her pelvis helps a bit as well.

Then, I rest her legs on my shoulders, rock forward, and move into position 2-nsfw. This is a lot of fun, as you can come back in for passionate kisses and she loves the deep penetration. Because you change the angle of entry, you'll also get a lot better contact on the g-spot. Legs might start cramping if this goes too long, so I slide her legs out to the side so she's spread wide. I'll put one hand behind her head and the other behind her lower back while passionately kissing and then forcibly rock backwards, carrying her with me.

If you do it right, your chests will stay in contact, her legs will wrap around you, and you'll fold your legs to complete the entry into position 3-nsfw. Sometimes, with some women, this position will make them have to urinate. With most women, this position gives deep penetration and outstanding g-spot contact. If you've done well, she should have already had at least one orgasm.

The finishing move almost always ensures that she does if she hasn't already. Extend your legs out, move her hands to your shoulders and either cradle her lower back or ass while you both lean your chests away to enter into position 4-nsfw. You get an amazing view and full friction. She gets the deepest penetration of the series, with a lot of pressure. If you're like me and you have an upward curve, you do all kinds of magical things to her hoo-hah in this position. She can also grind hard into you because she has great leverage with her hips.

Let her finish in this position and when she's stopped convulsing, put your hands on her wrists, remove them from your shoulders, and lower her onto her back as you pull out.