...a mature and older, yet beautiful elegant British woman. "Oh my goodness, is it over?" the woman who wear your girlfriend's clothes asks with her new mature voice and British accent.
"Y...yes,... it's over now, babe." you reply as you look at your former girlfriend who is now some British woman you never seen before.
"Deary, are you feeling okay?" your transformed girlfriend comes to as she touches your face and seems to worry about you, it seems like her personality is also change too, she's not like your usual girlfriend do. You first take a quick look at her face as you see her hair was a shoulder length and light blonde, it's now a bit grey and blonde with a headbun. Face is no longer a young girl, but an older woman with a pale skin and yet a she's still beautiful at her age. And then you look down at her body as you see her big breasts ahem... cleavage expose. You remember that your girlfriend's boobs are usually on the C cups size, but now they're F cups. "Deary dear, are you okay?" she asks again.
"Um... babe, you might as well take a look at the mirror." you reply to her as she then walks to the mirror near by. Then she's shockingly saw her appearance on the mirror as she never seen before. "Oh my goodness, I did regenerate." your former girlfriend says she surprises that she did regenerate. "And wow... come to think of it, I never had big breasts before in my life, and these clothes are so tight when I was before. And look at my face, I look so old,... and pale, oh... geez... I never realize I'm such an old lady."
"Babe, you're not an old lady, you're beautiful." you say as you cheer your former girlfriend up.
"Aww... thank you, dear. You're such a wonderful young man." she replies back to you with her smile. "Anyway, can you get me some clothes, these are seems so tight right now."
A few seconds later...
You gave your Mature British girlfriend some of your mom's clothes just for her to wear, she finally fit all of your mom's clothes, a white blouse, a black skirt, and a pantyhose. "Oh my, I can't believe these clothes seems to fit me a lot, thank, dear." she replies as she amazes them.
"Don't mention it, just hope this will keep long when you'll start regenerate again." you respond
"Yeah, I hope. Anyway, now I have regeneration power, what do you think we should do today, dear?" she asks you.