Train

I stood in the doorway, my maid's uniform perfectly arranged. I wanted to look down, wanted to look away, but knew to do so would bring an immediate spanking. So instead I kept my eyes focused on my mother-in-law, on her nylon covered legs, on the swell of her breasts.

"Well?" she asked after a minute or so.

I bit my lip, tried to will myself to stay small, to stay soft, knowing if I swelled, I'd quickly feel the spikes on the inside of the cage. "It...I'm trying," I said.

She shrugged. "I don't expect perfection," she said, "just that you understand the consequences of getting aroused by a woman."

"It...it's not...it's not easy," I said.

She shrugged. "Easy isn't the goal," she said, "staying flaccid is the goal, or learning the consequences of getting aroused by a woman."

"It's years of conditioning," I complained.

She narrowed her eyes. "What's my rule?" she asked, her voice firm.

"S...sissies don't...don't get aroused by women," I said.

"And if they do? The corollary?"

"S...sissies that get aroused by women are punished."

"Hence the spiked cage," she said, "instant feedback." 

"Please, I..." I winced as my penis swelled; even just mild swelling brought me in contact with the spikes.

"You know I'm willing to unlock you," she said. 

I winced again, knew she was, knew her conditions. "I...I'm fine," I lied.

"It's just a little dildo," she said, referring to the thick, eight inch dildo she had. That was her rule, her compromise. Sissies were permitted to swell if they were sucking cock. "It's only a matter of time," she said, "train yourself to only get aroused by men and I'll be happy to free that little thing."