Start with just some cuffs

It was a hard choice. The variety of BDSM toys on display was overwhelming, and a surprising number of them were unfamiliar. But it seemed hard to go wrong with a hefty pair of padded leather handcuffs, so Alex picked some off the wall and looked at the Matron, who eagerly held out her hands and stood still as Alex fumbled with the buckles and put a heavy duty leather cuff on each wrist. He stood back nervously, almost expecting a rebuke or for the Matron to change her mind.

“Good choice, these are very secure and comfy. Are there any other restraints you intend to use on me?”

She…wanted more?! Alex hurriedly looked back to where he had grabbed the cuffs and saw matching ankle and thigh cuffs. The Matron held out each leg helpfully as he put a cuff on each ankle. His cock twitched noticeably as he went to put the thigh cuffs on, but he politely refrained from touching her any more than necessary, trying hard to act nonchalant. Once both of her thighs were encircled with the leather cuffs, he stood up straight. The Matrons hands began to feel up his latex-covered cock, one squeezing the shaft and the other cupping his balls. Alex moaned.

“Don’t be shy my dear, be bold! You’ve cuffed me, now restrain me!”