Sometimes when I'm horny and alone, I use my phone camera to take photos or videos of myself naked or masturbating. I imagine what kind of photos or videos would turn my wife on if she watched them; what she would like seeing.
This makes me rock hard and I enjoy doing it with this thought in mind, even though she doesn't know and I've never showed her. Usually I delete the photos, but some I did save to a secret folder on my computer. I had more, but I deleted them as I thought maybe they were silly and she would be embarrassed or turned off if she saw them. I'm a bit embarrassed to ever show her as I'm scared she won't like them.
One time I sat in the shower against the back wall, naked, but not with the water on. I just wanted to be able to cum hard without worrying about the mess. I propped the camera up against something on the floor, facing towards my stiff cock as it stood straight up in my hand - long, hard, and again extremely aroused. I masturbated to a powerful climax and let myself cum hard, spurting it straight up in the air, everywhere. Drops landed all over my thighs and after the most powerful first few spurts had subsided, I continued pumping my hand on my engorged cock. Cum dripped and ran down my pulsing, messy, slippery shaft; all over my hand, my balls, the shower floor. It was wonderful to finish like that and then just wash off nicely in the shower and go back about my day.
I think my wife would be very turned on looking at these kinds of videos and photos I have of myself, that I ultimately made for her. One day, what I'd like to do is have her come in after she takes a shower. Make her sit down at my computer and show her them as surprise. Let her look through them, and then as she becomes turned on, I would crawl under the desk, open her towel and begin playing with her pussy. I would bury my face between her legs and make her cum with my mouth while she looks at me in the photos and videos masturbating for her.