OK this video the audio has been tampered with and all messed up. He does not say he is cumming until he already came on her. She does not say ah, this is until the title screen. This is a fucked up video whoever did this fucked around with the audio timing so it's garbage don't waste your time downloading!

by all means, just doing this for fun because no one else sub it. already busy enough with main works

Well I took the raw and took your subs and re-muxed them and now it's good. Something happened during this mux and it really fucked up the audio file. I recommend you re-mux and make sure your using the latest release of MKVToolNix and run the .ass through subtitle editor. 1. Load Subtitle Editor for the subtitle first thing it will ask is to resize it to match the video and approve it. Resave the subtitle. 2. Drop into MKV and remux This fixed the audio timing and the scaling for the subtitles and worked pretty good. But definitely an error on this current mux as she does not say Ah, This is until the title screen.