What are the simple little things you do to make yourself happy?

I’m in a committed relationship. I love her dearly, but the sex life had been pretty lacking. And by lacking I mean none at all. I know that’s no excuse for straying, but to my shame I did.
A woman I work with and I had gotten along great. We joked both innocently and inappropriately. One evening while texting she invited me over to her friends house to get in the hot tub. My significant other was sound asleep, so I went.
It all started out innocently with the three of us just sitting in the hot tub, when all of the sudden she took off her swimsuit. Her friend wouldn’t do the same, but she urged me to do so as well. I figured wtf, it’s not like I could see her. While I knew where this was going to end up going, I still thought it harmless to reciprocate.
Not long after we did so, her friend left to get more drinks for us all. As soon as she did so, she went under and started sucking on me. I did nothing to stop her. It felt good. Of course, being under water she didn’t do it for long. When she came up for air, we embraced and kissed passionately for the few minutes that it took for her friend to return with the drinks. Her friend kept giving me these looks that made me a tad uncomfortable. After we finished our drinks, we all got out, dried off and went inside.
After yet another drink, her and I went outside for a cigarette and her friend said she was going to bed. Wrapped in only towels, after said smoke, she lounged back on the porchswing (it was on the back porch, fenced in and very private lol), letting her towel fall away. She looked amazing. I couldn’t say no. I began to kiss her and explore her hot body. Kissing her fantastic tits, and working my way down. As I expected, when I finally got to her pussy, she was extremely wet. And she tasted so good! I hungrily lapped at her pussy for a good while. Bringing her close to cumming before I would hold back a little. After doing that a few times she came. And came hard. Trying to stay as quiet as we could, so as to not wake the neighbors, she begged me to fuck her.
I obliged. She felt amazing. Unfortunatly, with being as worked up as I was, and having not had sex in nearly three months, I didn’t last much longer than 5 mins. I pulled out and came all over her belly. She pulled me to her and kissed me.
After a few minutes we got up and went inside. Her friend was indeed asleep, so we sat on the couch. I had put on my shorts. Maybe after ten minutes we were kissing again and we both fell to the floor. Her on top. She took my shorts off and began sucking me off once again. I told her to flip around and we 69’d until I got hard again. She flipped over a rode me. I ran my hands all over her perfect body, thrusting up to match her rhythm. To make an already too long a story short, we changed positions numerous times for the next 30–45 mins or so. She came many times When I told her I was going to cum, she had me in my back and flipped back around to 69. I buried my face into her pussy as she sucked and jerked my cock while telling me she wanted me to cum in her mouth. It didn’t take long. When I came, it felt like an explosion. She continued to suck me dry. Swallowing every drop. As my orgasm subsided, I licked her back end from ass to clit while she kept sucking on my now softening dick. Not long after, we dressed and left. I got home and went to bed. I felt extremely guilty about it, but had to admit it was some of the best sex I had ever had. We remain friends but have both agreed that it’s unlikely to happen again.