Yes

You turn to her and say "Sure Mrs Spencer what do you need"

"I need some help organizing some books in the library, do you think you could help me"

"Sure" you reply

The both of you go down to the library and you start organizing the books.

You help her carry a box filled with books up to the library. You carry the box together since it is pretty heavy. Mrs Spencer gigantic boobs lie on op of the box while you both carry it. Concentrating on lifting is hard for you with those wonderful tits in your view. As you walk up the stairs her boobs start to bounce around falling back on the box with every step she goes up. You get an instant hard-on from imagining those juicy bags around your cock.

You arrive at the library and put the box down on a table. Mrs Spencer opens the box and both of you start to organize the books into the shelves.

Can you come over here and help me for a second?" Mrs Spencer asks you. She is standing on her toes trying to put a book into the upper shelf. She is just way too small to reach it. You walk behind her and take the book out of her hand and while putting it up where it belongs your body presses into her back. Your penis was back to being soft at that point, but once you lightly pressed it into her butt is awakened again. You don´t think she realised it though since you moved back quickly enough before actually getting fully hard.

You go back to putting the books into the shelves but can´t stop thinking about Mrs Spencer's ass and tits. After a few minutes you see Mrs Spencer struggeling with a book again. Once again you walk up behind her to help her. She didn´t see you walking up so gets a little bit startled as you take the book and put it where it belongs. This time it´s a little higher so you need to stand on your toes. So this time you press into her even more. Your full hardon presses against her ass this time.

You go back to do the job on your own again. Not even 30 seconds later she asks you again: "I am sorry... but can you help me again?"