She honestly didn't really need to hear him say it in return, didn't expect it all the time either. Ginny had always been the sort of person that (usually) didn't have any issue expressing how she felt out loud, but Harry wasn't the same as her. She didn't mind. She could feel it in the way he held her, see it in his eyes (well, when they weren't closed), hear it in his voice.
Ginny shifted slightly underneath him; he was still inside of her and she wasn't inclined to lose that closeness just yet. Instead she just gently kissed whatever warm skin of his she could reach as her hands made slow circles up his back. The pleasure had receded, leaving a very faint dull ache behind, but that was to be expected (she assumed). And it didn't stop her from feeling like that was the most amazing thing ever, and that she definitely wanted to do that again, soon.
The one other firm thought in her mind was this: it had definitely been worth it to wait all these years, to share this with Harry and no one else. She had never wanted to give that to anyone but him.