Finally the sequence started ramping down. I whimpered in relief as the dildos shrunk and the buzzing and licking at my swollen clit ceased. The mistress moved to my head and started unstrapping my mouth gag. She spoke as she worked.
"Hmmm the salve seemed to do an excellent job... Your pain levels are still quite low. I admit, for partially selfish reasons, I think we'll perform one last experiment... Amilia, attach the liter collection beakers, and turn the pumps to automatic. Then you may eat my ass. Watching kitten here has made me quite hard... and it's been over 2 hours since I've gotten relief. If ingesting my semen can produce satisfactory results, we can go ahead and start the next round of experiments tomorrow. Amilia, stop being such a prig and use that tongue of yours girl! Now, my pet, open wide."
The mistress unbuttoned her lab coat and brought out her already turgid cock. Behind the mistress's braced legs I could see Amilia kneeling as she did her duty. I wet my lips and licked the purple head before sucking it into my mouth. As before, she tasted delicious, and I struggled to take her girth and suck her in as deep as I could. I rolled my eyes up to look at her - she was pinching the nipple of one large breast with one hand, and with the other on the back of my shorn head she was guiding my mouth. Her face was relaxed and ecstatic as she fucked my throat. I brought my eyes back down and sucked harder, swallowing as much of her cock as possible, pleased to give her such pleasure. She gave a low moan as my cock worship paid off and she started fucking my mouth with vigor. My tongue and throat worked furiously at her thick length, flicking the head to taste any precum that collected there. I worked between breaths to suck sudden as much of it as I could. "That's it, kitten, swallow me down. Such a good pet. I'm going to cum now, swallow it all, every last drop!" She did, and I did. As I eagerly swallowed the last drops I heard and felt the pumps work harder on my heavily swollen breasts. Despite my recent prolonged orgasm, could feel wetness dripping down my thighs again and I longed to be fucked. The mistress let her cock soften in my mouth as the pumps worked at me. She pulled out, her semi-hard cock glistening with my saliva against her thigh.
The mistress petted me with one hand as she did up her coat buttons with the other. "Mmm, lovely. You may stop Amilia. Monitor her output and stop the pumps once she returns to her baseline rate, then escort her to her room. Now kitten, I'll be leaving you in the harness with the climax aids in place. You're to wear them constantly. Don't worry, everything is waterproof. You have leave to use them whenever you need, but you're required to hook the pumps to your breasts when you do. Your room has been outfitted with a set of them by your bed. In fact, the harness won't activate until you've turned on the pumps. You have my permission to orgasm however much you like... You'll know when I want you to stop. I'll see you midday tomorrow for your next experiment." With a kiss to my forehead the mistress left the room, leaving me alone with Amilia.
The veneer of servility dropped completely from Amilia.
"Are you proud of yourself, you cow? 'An unprecedented effect'," Amilia mocked. "You could have been anyone. The mistress should have selected me. 2 years in her service and she hasn't given me a single enhancement. Well, at least I'm not an experiment. You're going to end up a milch-cow, milked day and night and fed only sperm the rest of your days. You like those big tits now, but just wait till they sag to your waist and your nipples are the size of saucers."
I glared at her. My gag had been replaced or I would have given her a piece of my mind. I'd known what I was getting into. I was smart and educated in the sciences, but with other species being smarter there were limited job opportunities for humans in science these days. At least this way I was being a part of science and gaining a lucrative career option as a milkmaid. Plus I'd always been fascinated with milkmaids. The fact that my attributes were outstripping those of the average milkmaid made me secretly very excited. Maybe the mistress would even have a job for me once my contract was up and I could be research assistant and milkmaid both.
Amilia ignored me in fuming silence the rest of the half hour my milking took. She marched me back to my room, impatiently removing my head harness, and then left without a word. I sighed in relief, and then eagerly looked for the pump station, still horny from earlier...