Sister round 2

It finally happened again! Yes my sister used me as a toilet slave again while i was tied up and crossdressed like a sissy! Well my parents left again this time for 3 days.. the first day they left i called my sister! I said hey s*s mom and dad left for buisness today just thought id say hi its been awhile, we talked a little then hung up.. she must have been waiting like like i have been for this again! As soon as she came in she came right to my room and said get dressed! Lets go!! Dressed like a girl now! So i put my panties on and my hollister jeans and my bra and cami, my cock was bulging out in the jeans hehe! My sister was dressed in a sweatshirt and yoga pants she looked sexy! She then tied me up and sat on my face with her yoga pants covered booty! She smothered me for about 2 minutes then said ready? I hope your hungry like last time! She said keep your mouth open slave you dont close it till i tell you too! I did as she said.. still tied up my sister then pulled her yoga pants and panties down and sat on my open mouth, she then pushed out a soft mushy shit right into my mouth, instantly it filled my whole mouth up but more kept coming it started to push poop down my throat! Starting to gag my sister quickly hops up and puts a few pieces of duct tape tightly across my mouth, now tied up with a mouthful of shit duct taped closed my sister pulls out a thin plastic garbage bag from her hoodie, she puts the bag over my head and waits for me to release all my current breath then she tightly seals the bag with tape so im tied up forced to swallow my sisters shit while im bagged with breathplay