Family Ties/Push Heather down so you can fuck her mouth.
"I'm sorry Heather!" Your sister looked confused for a second then you pushed her to the ground with all your strength. Before Heather could fix herself, you grabbed her arms by the wrists and held them over her head, preventing her from pushing you off.
Then you positioned body over her head with your dick pointed straight at her mouth.
"Timmy what the-" Her words were cut off as you filled with her mouth your dick, going as deep as you could go in one thrust. You felt it hit the back of Heather's throat and pulled out then went back in and soon you built a rhythm.
Heather squirmed and struggled but her position offered her no way out of this, letting you thoroughly abuse her throat pussy.
You grunted and spoke up, "This is all your fault, walking around nearly naked whenever you have to babysit me," You blamed her. "When I peeked on you this morning, I wanted to rape your pussy so badly. You even teased me as you got dressed!"
“Gggmmphh…! Aaaaggghh… Hoaaaaaggh…!” She tried to say, but any words were stifled by your meat staff.
"But now I'm going to pay you back for all that," You emphasized this with a hard thrust and hit the back of her throat against, making Heather's eyes widen and throat bulged. "I'm going to enjoy you in any way I can!"
A few minutes passed as you continued to rape Heather's mouth and before long, the urge to cum was rising. You went as deep as you could possibly go and released your cum down your older sister's throat.
Once you were finished, you finally got off her face and Heather took a big gasp of air before coughing. You grabbed Heather's shirt and used it to tie her wrists together to prevent her from using them.
Then you stood up and admired your sister's older body, enjoying the sight of her helpless on the ground and at your mercy.
"Timmy, I'm sorry for teasing you," Heather gasp out as tears fell from her eyes. "Please just let me go and I won't tell anyone what happened."