I don't see why not

You scurry your way up the stairs, attempting to make as little noise as possible. You follow the sound of running water which takes you straight to the bathroom. To your surprise the door wasn't locked, in fact it wasn't even closed. You push on the door a little to make the crack bigger. You take a look through the opening you had just created, and what you see is just what you had been hoping. You though about it on the way up the stairs. "What if the door is locked? What if there is a shower curtain? What if the slider is an obstructing one?"

"I'm so lucky!" You thought to yourself as you peer directly at your mother in the nude, fondling her large breasts with soap in her hands, her eyes are closed, she tilts her head to the rhythm of her humming. At this sight you start to struggle with your pants; as if you've completely forgotten the fact that it had a button and zipper. It took a little while for you to get those pesky pants down to your ankles. As you grabbed your now rock hard penis your mother turned around and started to rub the soap on her juicy ass. It was only now that you started to realize how fit and youthful your mother was for her age, and you loved her even more for it. You were stroking rather aggressively now, she had just opened her bright green eyes, and was reaching to turn off the shower; you were **** to cum now, the show couldn't end now! She turned the water off and started to head in your direction. Without cumming you quickly pulled your pants up and started to move away from the door. She stopped short of the door and picked up the jeans she was wearing when you guys were working, she reached into the pocket and pulled out her phone, she turned around and started to walk back to the shower. She sat down in the puddle made from the shower and started typing something on her phone. You had taken your pants back off, you had a good feeling about this. She was now nibbling on her lip as she fiddled with her gorgeous brown hair. You started to stroke yourself slowly again, then she spread her legs and removed her free hand from her hair. She was blushing heavily now that her free hand had made its way to her pussy. She extended her middle finger and started to draw slow circles around her clit. This had to have been the sexiest thing you've ever seen, out of all of the things you've masturbated to. This was the hottest. You were stroking yourself feverishly now, if she wasn't your mother you would've barged in and asked if you could lend a hand. You were close to exploding, but you stopped. You needed to see where this goes. Your mom had just stopped with her clit, and moved her hand lower. She inserted to fingers into her pussy. She let out a sexy moan as she did so. Without even touching your dick this sent a shockwave of pleasure through your body. She started feverishly schlicking away with her fingers letting out loud and sexy moans the whole time. You didn't touch your dick, but it felt like it was being stroked, a familiar yet new feeling. Suddenly, liquid started pouring out of your mother's pussy she let out a sexy shriek. Right at that moment you let out your load, but never once did you touch your dick. She dropped her hands to her side and started breathing heavily, a smile on her face. Your cum had coated the wall beside you, but you didn't even make an effort to clean it up. You pulled your pants up and started down the stairs, but you froze in place when the door swung open. You took a position like a cat stalking prey, in an attempt to conceal yourself. Your mother walked out of the bathroom with a towel on. She turned in your direction, but stopped when she noticed your cum. She looked down the stairs, back at the cum. Then smiled. Then to your surprise she crouched down and licked the cum off the wall. You were rock hard once again. She walked downstairs and to her room as you walked into yours, sure of a good nights sleep.