Kristen is not noticeably bigger.

Sam returned carrying a bundle of clothes so he had to use his rear to open the door. "I grabbed the largest set they had since you took a full dose." He turned around and saw his boss with a flush face and panting heavily. "You ok? Are you having a reaction?"

Kristen shook her head and held out a hand for the new clothes. "No, the mood enhancer is making me horny. It hit sooner than I was expecting." She said walking away to change in her office.

In the office Kristen let out her breath she had not realized she was holding in. Sam was a professional but he was also a guy. The last thing Kristen wanted was to be naked in front of Sam. Having clothes that wouldn't rip apart as she grew was a relief.

The growth outfit looked like a set of black workout clothes that were designed to be much more elastic than normal. Kristen's own experience was even if she was 12 feet tall she would not burst out of these clothes. Today however kristen intended to test the limit of the outfit.

Taking her blouse off Kristen noticed that her breasts looked a little fuller. With how much the mood enhancer was affecting her, Kristen expected her breasts to be a lot bigger by now.

As she undressed Kristen focused on the now constant heat in her body. It was there waiting for something to trigger it. The scientist theorized that since the mood enhancer boosted feelings as they came it must be holding the growth serum back until it was triggered by some form of stimulation.

After donning her new clothes Kristen stretched out with her arms over her head. Suddenly the heat in her body surged in strength. The rush of pleasure caught Kristen off guard and she couldn't help but moan as she felt her whole body grow bigger. From past experience Kristen felt she was an inch taller. "Sam write down that stretching causes full body growth."

Kristen said coming out from her office.

"Ah ok." Sam said as he began writing again. "Are you saying the growth can be triggered?"

With a smile Kristen stretched again, holding it longer this time and she felt the heat build up the longer she held it. When she released the stretch Kristen gasped as a euphoric pleasure washed over her as her body grew larger. It felt like she had gained 3 inches that time. "Yes, the growth can be triggered." Kristen said giggling as she watched Sam's face turn red.

"Do you want to test other forms of simulation next?" Sam asked.

Kirsten responded by stretching again. "Let me, ahh- get up to, ahh-h six feet first. Ooh yeah." Now that she knew how to trigger it the woman quickly stretched herself to 6 feet tall. Each inch filling Kristen with pleasure as she grew. It took a conscious effort to not go past her goal. "That feels amazing."

"What sort of stimulation you want to try next?" Sam asked but his eyes were saying what he was hoping was next. The man's eyes had hardly left Kristen's chest since she left her office. And due to the thin stretchy material of the growth outfit and her arousal, Kristen's nipples were on full display.

Slowly, while looking Sam in the eyes, Kristen brought her hands up to her chest and grabbed her small tits and gave then both a soft squeeze. Sam stood there with his mouth hanging open as he watched. The heat rushed to Kristen's chest making her moan again as she quickly let go, not wanting to go over board with her "stimulation."

As expected, the direct stimulation resulted in Kristen's breasts quickly jumped larger about one full cup size. Feeling daring Kristen circled a finger around her nipples until she felt her areola swell into the thin fabric and pinched her nipples for good measure making them swell.

The fabric rubbing on her growing egregious zones and her new tits pushed Kristen over the edge. "Oh God! Yes!" She cried out. As an orgasm rocked Kristen Stewart her body shook as her growth accelerated.