Driven by her new hormones, Diane felt an instintive desire for what her mother wanted to do with her and wanted her to go further. Due to this feeling, she did not find the will to physically resist her mother's advances, limiting herself to saying completely ineffective phrases to avoid the incestuous relationship.
Christine, who felt more excited by Diane's shame, stopped kissing her daughter's dick to stimulate the tip using her tongue. Eventually Diane started to moan, but was interrupted by Christine, who assumed that her husband would have to know what was going on with their daughter, but not so soon otherwise he would disturb them.
For Diane, her lust only increased and, as a result, she soon felt that not only was her dick hard, but her nipples were also firm and perky. She grabbed her breasts, noticing that they seemed a little fuller, and stimulated her nipples, feeling them much more sensitive than normal. It took her a moment to notice her nipples elongate, and when they did, she stopped everything and looked to find that they both now prostrated erect on her chest at an inch in length each.
Christine noticed Diane's sudden stop and looked to see why, then laughed and went back, now placing her daughter's hard cock between her breasts and sucking the tip while titfucking her.
The new stimulation made Diane have to hold back from moaning, and her nipples pulsed, gaining more length. She no longer cared that what they were doing was wrong or that she might be changing again, she just closed her eyes and caressed her expanding nipples while her mother sucked and titfucked her cock.
The nipples growing longer and becoming thicker went completely ignored, even though Diane needed to use more and more fingers and, eventually, her entire hands to stroke them, feeling a liquid dripping onto her hands. Looking at her breasts like this, the girl discovered that she now had a pair of almost 6 inch dicks in place of her nipples, both hard and with precum oozing out of them. Christine realized what was happening and was impressed, thus becoming more motivated to make her daughter cum.
As they continued, Diane's dicknipples continued to grow until they reached 8 inches, and her breasts had grown to three cup sizes. An explosive sensation accumulated and rose through her dick and dicknipples, bringing her to an orgasm more intense than the previous ones. As she came, to avoid moaning loudly, Diane stuck her right dicknipple in her mouth, discovering that they ejaculated milk as she swallowed. Christine tried to swallow all of her daughter's cum, but she couldn't handle the amount and let a lot of the contents run down her chin and drip, while her head and back were covered in cum spurted from Diane's left dicknipple, which was aimed towards her.
After the orgasm, Diane lay on her bed to catch her breath, but...